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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2020
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three-Months Ended September 30, | ​ | Nine-Months Ended September 30, | ​
​ | ​ | 2020* |  | 2019 |  | 2020 |  | 2019 | ​
Dividend yield | ​ | — | ​ | 0.0 | % | 0.0 | % | 0.0 | %
Expected volatility | ​ | — | ​ | 30.2 | % | 30.5 | % | 30.2 | %
Risk-free interest rate | ​ | — | ​ | 1.4 | % | 0.7 | % | 2.4 | %
Expected term | ​ | — | ​ | 5.8 | years | 5.8 | years | 6.0 | years
​ *No options were granted during the three-months ended September 30, 2020. ​
Summary of activities with respect to its stock option plans |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Aggregate
​ | ​ | Shares (in | ​ | Price Per | ​ | Term (In | ​ | Intrinsic
Options |  | thousands) |  | Share |  | years) |  | Value
Outstanding at January 1, 2020 |  | 14,941 | ​ | $ | 42.88 |  | 6.3 | ​ | $ | 308,884
Granted 01/01/20 - 03/31/20 |  | 1,027 | ​ | $ | 62.45 | ​ | ​ | ​ | ​ | ​
Granted 04/01/20 - 06/30/20 |  | — | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Granted 07/01/20 - 09/30/20 |  | — | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Exercised |  | (1,711) | ​ | $ | 38.30 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (53) | ​ | $ | 52.91 | ​ | ​ | ​ | ​ | ​
Outstanding at September 30, 2020 |  | 14,204 | ​ | $ | 44.81 |  | 6.0 | ​ | $ | 502,732
Vested and expected to vest in the future at September 30, 2020 |  | 13,594 | ​ | $ | 44.23 |  | 5.9 | ​ | $ | 488,969
Exercisable at September 30, 2020 |  | 8,174 | ​ | $ | 36.97 |  | 4.7 | ​ | $ | 353,333
​ No options were granted during the three-months ended September 30, 2020. The weighted-average grant-date fair value of options granted during the three-months ended September 30, 2019 was $18.32 per share. The weighted-average grant-date fair value of options granted during the nine-months ended September 30, 2020 and 2019 was $18.78 per share and $20.24 per share, respectively.
Summary of activities with respect to non-vested restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ | ​ | Shares (in | ​ | Grant-Date
​ |  | thousands) |  | Fair Value
Non-vested at January 1, 2020 | ​ | 825 | ​ | $ | 57.62
Granted 01/01/20 - 03/31/201 | ​ | 392 | ​ | $ | 62.39
Granted 04/01/20 - 06/30/20 | ​ | 17 | ​ | $ | 71.72
Granted 07/01/20 - 09/30/20 | ​ | 1 | ​ | $ | 71.76
Vested | ​ | (287) | ​ | $ | 55.65
Forfeited/cancelled | ​ | (2) | ​ | $ | 59.67
Non-vested at September 30, 2020 | ​ | 946 | ​ | $ | 60.46

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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